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Tokamaks

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A nuclear fusion reactor in which a magnetic field keeps charged, hot plasma moving in a doughnut-shaped vacuum container.

Versatile physics leader Stefan Gerhardt elected an APS fellow

Stefan Gerhardt, who heads research operations and serves as deputy director of the recovery project for the flagship fusion facility at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL), has been elected a 2019 American Physical Society (APS) Fellow. The APS annually recognizes as fellows no more than one-half of one percent of its more than 55,000 worldwide members.

Today’s forecast: How to predict crucial plasma pressure in future fusion facilities

A key requirement for future facilities that aim to capture and control on Earth the fusion energy that drives the sun and stars is accurate predictions of the pressure of the plasma — the hot, charged gas that fuels fusion reactions inside doughnut-shaped tokamaks that house the reactions. Central to these predictions is forecasting the pressure that the scrape-off layer, the thin strip of gas at the edge of the plasma, exerts on the divertor — the device that exhausts waste heat from fusion reactions.

PPPL physicist Stoltzfus-Dueck will explore the performance of fusion plasma with an Early Career Research Award

Timothy Stoltzfus-Dueck, a theoretical physicist at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL), has won a DOE Early Career Research Award for exceptional scientists in the early stages of their careers. Stoltzfus-Dueck will use the five-year, approximately $500,000 per year award to develop and test models essential to the confinement of plasma, the hot, charged gas that must be tightly confined in doughnut-shaped devices to produce fusion reactions.

PPPL physicist Stoltzfus-Dueck will explore the performance of fusion plasma with an Early Career Research Award

Timothy Stoltzfus-Dueck, a theoretical physicist at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL), has won a DOE Early Career Research Award for exceptional scientists in the early stages of their careers. Stoltzfus-Dueck will use the five-year, approximately $500,000 per year award to develop and test models essential to the confinement of plasma, the hot, charged gas that must be tightly confined in doughnut-shaped devices to produce fusion reactions.

Improving the magnetic bottle that controls fusion power on Earth

Scientists who use magnetic fields to bottle up and control on Earth the fusion reactions that power the sun and stars must correct any errors in the shape of the fields that contain the reactions. Such errors produce deviations from the symmetrical form of the fields in doughnut-like tokamak fusion facilities that can have a damaging impact on the stability and confinement of the hot, charged plasma gas that fuels the reactions.

Seeing more clearly: Revised computer code accurately models an instability in fusion plasmas

Subatomic particles zip around ring-shaped fusion machines known as tokamaks and sometimes merge, releasing large amounts of energy. But these particles — a soup of charged electrons and atomic nuclei, or ions, collectively known as plasma — can sometimes leak out of the magnetic fields that confine them inside tokamaks. The leakage cools the plasma, reducing the efficiency of the fusion reactions and damaging the machine. Now, physicists have confirmed that an updated computer code could help to predict and ultimately prevent such leaks from happening.

Seeing more clearly: Revised computer code accurately models an instability in fusion plasmas

Subatomic particles zip around ring-shaped fusion machines known as tokamaks and sometimes merge, releasing large amounts of energy. But these particles — a soup of charged electrons and atomic nuclei, or ions, collectively known as plasma — can sometimes leak out of the magnetic fields that confine them inside tokamaks. The leakage cools the plasma, reducing the efficiency of the fusion reactions and damaging the machine. Now, physicists have confirmed that an updated computer code could help to predict and ultimately prevent such leaks from happening.

Physicist Rajesh Maingi heads nationwide liquid metal strategy program for fusion devices

Rajesh Maingi, a world-renowned expert on the physics of plasma, has been named to co-lead a national program to unify research on liquid metal components for future tokamaks, doughnut-shaped fusion facilities. Maingi, who heads research on boundary physics and plasma-facing components at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL), will coordinate the three-year project in conjunction with Oak Ridge National Laboratory and the University of Illinois at Urbana-Champaign.

Physicist Rajesh Maingi heads nationwide liquid metal strategy program for fusion devices

Rajesh Maingi, a world-renowned expert on the physics of plasma, has been named to co-lead a national program to unify research on liquid metal components for future tokamaks, doughnut-shaped fusion facilities. Maingi, who heads research on boundary physics and plasma-facing components at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL), will coordinate the three-year project in conjunction with Oak Ridge National Laboratory and the University of Illinois at Urbana-Champaign.

Discovered: A new way to measure the stability of next-generation magnetic fusion devices

Scientists seeking to bring to Earth the fusion that powers the sun and stars must control the hot, charged plasma — the state of matter composed of free-floating electrons and atomic nuclei, or ions — that fuels fusion reactions. For scientists who confine the plasma in magnetic fields, a key task calls for mapping the shape of the fields, a process known as measuring the equilibrium, or stability, of the plasma. At the U.S.

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